Abstract-High-temperature terahertz intrawaveguide spectroscopy using hollow-core sapphire photonic crystal waveguide

Gleb M. Katyba,  Vladimir N. Kurlov,  Kirill I. Zaytsev,

https://www.spiedigitallibrary.org/conference-proceedings-of-spie/11065/2526292/High-temperature-terahertz-intrawaveguide-spectroscopy-using-hollow-core-sapphire-photonic/10.1117/12.2526292.short

An ability to use sapphire hollow-core terahertz (THz) waveguides for high-temperature intrawaveguide spectroscopy was studied experimentally. We assembled an experimental setup, which employs the principles of THz intrawaveguide spectroscopy and uses a backward wave oscillator, as a continuous-wave THz source with tunable output frequency, and a Golay cell, as a detector of THz wave intensity. In this setup, the sapphire shaped crystal serves simultaneously as an optical waveguide and as a sample cuvette; the analyte is placed in its central hollow channel. We applied the setup for high-temperature measurements of sodium nitrite (NaNO₂) powder. The observed results demonstrate an ability to sense melting of NaNO₂-powder; justifying a prospect of sapphire waveguides in THz measurements in harsh environments, at high temperatures and pressures.

© (2019) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.

Abstract-In vitro terahertz dielectric spectroscopy of human brain tumors

Kirill I. Zaytsev,   Nikita V. Chernomyrdin,  Kirill M. Malakhov,  Sheyh-Islyam T. Beshplav ;  Sergey A. Goryaynov,  Vladimir N. Kurlov,  Igor V. Reshetov,  Alexander A. Potapov, Valery.V. Tuchin

https://ieeexplore.ieee.org/document/8435242/

Modern progress in terahertz (THz) diagnostics of malignancies, including non-invasive, least-invasive and intraoperative techniques is briefly discussed. Special attention is paid to intraoperative diagnosis of brain tumors, which is a rapidly developing field nowadays. We discuss our recent results in this research field, which are associated with (i) in vitro studies the THz dielectric response of gelatin-embedded human brain tumors (including gliomas and meningiomas featuring different grades), (ii) analysis an ability for differentiation between normal and pathological tissues of the brain relying on the methods of THz spectroscopy and imaging, and, finally, (iii) development of novel THz instrumentation for the intraoperative detection of margins of tumors in order to guarantee its gross total resection.

Abstract-Technological aspects of manufacturing terahertz photonic crystal waveguides based on sapphire shaped crystals

Gleb M. Katyba; Kirill I. Zaytsev; Sergey N. Rossolenko, Irina A. Shikunova, Sergey L. Shikunov,  Dmitriy O. Stryukov,  Stanislav O. Yurchenko, Vladimir N. Kurlov

https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10333/103331C/Technological-aspects-of-manufacturing-terahertz-photonic-crystal-waveguides-based-on/10.1117/12.2270168.short?SSO=1

Recently, terahertz (THz) photonic crystal waveguides based on sapphire shaped crystals have been proposed. These waveguides combine unique properties of sapphire with advantages of the edge-defined film-fed growth (EFG) or Stepanov technique of shaped crystal growth and allow guiding THz waves in a wide spectral range with small dispersion and losses. The sapphire photonic crystal waveguides are capable for operation in aggressive environment, which makes possible to perform high-temperature and high-pressure THz measurements, as well as THz measurements of aggressive chemicals. In this paper, the technological aspects of sapphire THz photonic crystal waveguide manufacturing by the EFG/Stepanov technique (including, the problems of seeding and automated control of multichannel shaped crystal growth) have been described. Prospective applications of sapphire photonic crystal waveguides in various branches of THz science and technology have been discussed.

© (2017) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.

Abstract-Technological aspects of manufacturing terahertz photonic crystal waveguides based on sapphire shaped crystals

Gleb M. Katyba, Sergey N. Rossolenko, Irina A. Shikunova, Sergey L. Shikunov, Dmitriy O. Stryukov, Vladimir N. Kurlov

Institute of the Solid State Physics (Russian Federation)

Kirill I. Zaytsev, Stanislav O. Yurchenko

Bauman Moscow State Technical Univ. (Russian Federation)

http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=2635665

Recently, terahertz (THz) photonic crystal waveguides based on sapphire shaped crystals have been proposed. These waveguides combine unique properties of sapphire with advantages of the edge-defined film-fed growth (EFG) or Stepanov technique of shaped crystal growth and allow guiding THz waves in a wide spectral range with small dispersion and losses. The sapphire photonic crystal waveguides are capable for operation in aggressive environment, which makes possible to perform high-temperature and high-pressure THz measurements, as well as THz measurements of aggressive chemicals. In this paper, the technological aspects of sapphire THz photonic crystal waveguide manufacturing by the EFG/Stepanov technique (including, the problems of seeding and automated control of multichannel shaped crystal growth) have been described. Prospective applications of sapphire photonic crystal waveguides in various branches of THz science and technology have been discussed. 

© (2017) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.